KX85 piston comparison

[L Rider]

Guess so! Bit stink but oh well, lucky I have a kit on hand from Bart's farts parts Means no riding tomorrow though
So where's she gonna run it in Clmintie? Sandpit? I'm not really sure what to do for that bit.

I ran mine in at Sandpit - was back when i could only ride the learners so did it on that. Could do it on some of the easy tracks out their though. SIL's we ran in at Thunder back in summer

[clmintie]

If you haven't wiped the old piston , con you post a couple more pictures ?

why is one side lean and the other not? a ;leak ?

lots of blow by .

and can i see graining on the inlet side ? air cleaner dirty ?


I am only guessing from the pictures ..

Stephen

Here's some more pix for you..... Note that the pix make the carbon look thicker that it is, as I run my finger over the line between 'shinny' and carbon, it's hard to feel any difference in height...Maybe better described as 'soot' no doubt due to using a blend of TTS and R30. We use 3 air cleaners and chuck a clean one in every ride, often between races in summer. Airbox gets duct taped when very wet.... I realise by leaving it in for 100 hours, I've pushed this piston way beyond what would normally be called it's 'use by date' it's just that the first 30 40 hours were pretty 'gentle'.....

[clmintie]

Guess so! Bit stink but oh well, lucky I have a kit on hand from Bart's farts parts Means no riding tomorrow though
So where's she gonna run it in Clmintie? Sandpit? I'm not really sure what to do for that bit.

Sand pit on Wednesday............. Day off to ride with the 'Sandpit Fanny Pack'

[Midget200]

Sand pit on Wednesday............. Day off to ride with the 'Sandpit Fanny Pack'

Oh you lucky man riding with the Fanny Pack!!! I haven't got a bike. Put mine back to full-sized. Hard to find a good 85 on Trade Me. Might have to buy new! Need it by Wednesday.

[buffstar]

Oh you lucky man riding with the Fanny Pack!!! I haven't got a bike. Put mine back to full-sized. Hard to find a good 85 on Trade Me. Might have to buy new! Need it by Wednesday.

well! it wouldnt be the fanny pack without ya luv

[buffstar]

oh whoops better watch out for the thread police

sorry all

[clmintie]

Guess so! Bit stink but oh well, lucky I have a kit on hand from Bart's farts parts Means no riding tomorrow though
So where's she gonna run it in Clmintie? Sandpit? I'm not really sure what to do for that bit.

I've shown you mine, you gunna show me yours???

Can you post a pic of your old piston please?

[clmintie]

Oh you lucky man riding with the Fanny Pack!!! I haven't got a bike. Put mine back to full-sized. Hard to find a good 85 on Trade Me. Might have to buy new! Need it by Wednesday.

Oh I do hope you can ride Wednesday, the girls are really looking forward to it.... Just don't buy the one I might need the bolt off at Spectrum.......

[green machine]

Oh you lucky man riding with the Fanny Pack!!! I haven't got a bike. Put mine back to full-sized. Hard to find a good 85 on Trade Me. Might have to buy new! Need it by Wednesday.

Go on get a new one.....nuthin like throwing ya leg over a bike that no one's ridden before!!!

[barty5]

I've shown you mine, you gunna show me yours???

Can you post a pic of your old piston please?

Hmm not lookin good they bought it out to albany for me to have a look at couple a bad scrapes on the piston looks like it was bout to have a sezie up. recommended getting workshop to take closer look at the bore for them and clean it up if pos.

[Midget200]

Go on get a new one.....nuthin like throwing ya leg over a bike that no one's ridden before!!!

I know, I know, so tempting! I'm gonna go down to Spectrum tomorrow and have a sit on one! The trouble is they won't give me much on a trade in! I'm prepared to drop, but not too much!!! I've had my bike on Trade Me for nearly 2 weeks, 160 views, but no one buying! Buggar!!!

[noobi]

i think that the map on that piston means that the ports arnt flowing as well as they could, like the air isnt meeting in the middle and combusting more on one side, you can tell because its not a symmetrical shape

we're probably going out on wednesday too. weather dependant at this point. was pretty good today though

[SpikedPunch]

I've shown you mine, you gunna show me yours???

Can you post a pic of your old piston please?

As Bart said, it's not looking fantastic. Krad's got some pix on his phone he can show ya later.
Trying not to get too panicked until we've had it looked at proper, but 'gutted' would be an understatement. Fix bike or get wisdom tooth out..hrrmmm

[barty5]

As Bart said, it's not looking fantastic. Krad's got some pix on his phone he can show ya later.
Trying not to get too panicked until we've had it looked at proper, but 'gutted' would be an understatement. Fix bike or get wisdom tooth out..hrrmmm

both sound just as sorta painfull bike should be ok sure its not as bad as it look just pay for second opinion

[camchain]

i think that the map on that piston means that the ports arnt flowing as well as they could, like the air isnt meeting in the middle and combusting more on one side, you can tell because its not a symmetrical shape

KTM mech told me burn pattern on my piston should look like a 'map of Australia.' I thought this sounded weird until I saw my piston. Turned out to be a very good description. Maybe gassers have 'map of Tassie?' lol